Surfacing and polishing machine.



No. 802,605. PATENTED OUT. 24, 1905. A. T. $PENCE, J. H. PRUGI-I & S. B. ZIMMER. SURPAOING AND POLISHING MACHINE.

APPLIOATIOT ILED PEB- 6. 1905.

llTFll) STATES PATENT OFFICE.

AARUN T. SPENCE, JOHN ll. PRUGH, AND SAMUEL B. ZIMMER, OF OAKLAND, CALIFORNIA.

SURFACIING AND POLISHING MACHINE.

Specification of Letters Patent.

Patented Oct. 24., 1905.

Application filed February 6, 1905. Serial No 244L468.

To (LZZ 74/77/0777, it rrm/y con/eer e:

Be it known that we, AARON T. SPENoE, JOHN H. PRUGII, and SAMUEL B. ZIMMER, citizens of the United States, residing at Oakland, in the county of Alameda and State of California, have invented. new and useful Tm provements in Surfacing and Polishing Machines, of which the following is a specification.

Our invention relates to an apparatus which is especially designed for producing even surfaces and cleaning or polishing any surface to which such an apparatus may be applicable.

It consists in the combinations of mechanism and in details of construction, which will be more fully explained by reference to the accompanying drawings, in which Figure 1 is a longitudinal section through polishing-drum. Fig. 2 is a view of same, showing slot. Fig. 3 is a transverse section through drum, showing jaws open. Fig. A: is an end view of same.

It is the object of our invention to provide a mechanism for stretching and securing abrading surfaces upon drums or rollers to which such surface is to be applied and in such a manner as to provide a substantially even and unbroken surface which may be easily removed and. replaced at will, the device being applicable either to a stationary apparatus, over which the surface to be treated is caused to pass, or it may be so mounted as to travel over surfaces which themselves may remain stationary.

For the purpose of producing an even surface and to polish wooden floors or other surfaces it has been found that sandpaper or some equivalent therefor is very efficient. In order to secure such material to produce the greatest efficiency, it is desirable to stretch it upon drums or rollers which may be revolved in contact with the surface to be polished. As shown in the drawings, A rep resents a roller of this description. The roller is preferably made of sheet metal having heads or ends 2, the hubs or centers of which are carried upon a shaft, as at 3. The peripheral surface of the drum A has a slot made along one side for the purpose of re- .ceiving the edges of the sandpaper or equivalent material 4, which is wrapped about the drum. Experience has shown that if such a slot be made parallel with the axis it will produce a slight bump or shock at each contact which it makes with the surface to be polished, and this will make a corresponding irregularity in such. surface. We have therefore shown this slot or channel 5 as extending diagonally from one end of the roller to the other, so that it does not all come in contact with the surface atone time, but successively from one end to the other. In order to stretch and lock the abrading material firmly and smoothly around the drum, we have shown jaws, as at 7 which are preferably corrugated upon their contiguous faces, so as to form efficient contacting surfaces and grip when brought together. These jaws have a length substantially equal to that of the drum and are mounted upon lever-arms 8 and 9. These arms are mounted upon a rod or shaft 10, which forms a fulcrum about which one of the j aws are turnable to open or close and which is supported in slots in the drum-heads. The inner ends of the arms 8, which form continuations from the jaws upon the opposite side of the fulcrum-rod 10, are enlarged, so as to clasp the shaft 3 and eccentrics 12, which are fixed to and turnable with this shaft. It will thus be seen that when these eccentrics are turned either. with or upon the shaft they will act to expand or separate the inner ends of the lever-arms, and thus close the jaws 7. These jaws may be arranged in various ways. In a convenient construction here shown the jaw 7 fits closely against one side of the opening or slot in the drum, and the opposite jaw, being movable, can be separated from the first-named jaw sufliciently to allow the inturned edges of the matirial which covers the drum to be inserted. By turning the eccentrics upon or with the shaft 3 the inturned edges of the material will be firmly gripped between the edges of the aws, which may preferably be serrated or otherwise formed to tightly grip the material. The turning of the eccentric will force the arm of the movable jaw outward, thus closing this jaw against the stationary one and subsequently draw both jaws toward the center to draw the covering material tight. l/Vhenever the material is worn or it is desirable to replace it, it is only necessary to reverse the movement of the shaft, and by means of a pin 13, projecting from the eccentric, and a similar pin 14, contiguous thereto and fixed to the lever 8, the reverse movement of the shaft will cause the pins to contact, and thus separate the jaws and release the covering material, which can then easily be removed.

The fulcrum-shaft 10 extends through slots or openings in the drum-heads 2, and these drumheads also have channels made in them of sufficient width to receive the jaws 7 and allow of sufficient movement to correspond with the movement of shaft 10 in the channels or openings made in the drumheads. The action of the eccentrics when turned will first close the jaws to grip the inturned edges of the material and then draw them inward until the covering material fits tightly around the drum.

Having thus described our invention, what we claim, and desire to secure by Letters Patent, is

1. In a surfacing or cleaning machine, a drum or roller having a slot made longitudi nally in its periphery, a surfacing material surrounding the drum having its edges inturned through the slot, fixed and movable gripping-jaws by which the inturned edges are locked and retained, a shaft passing through both jaws and upon which the movable jaw is fulcrumed said movable jaw having a lever-arm continuation beyond its fulcrum, and means engaging said arm extension and adapted to rock the movable jaw about its fulcrum and relative to the fixed jaw.

2. In a surfacing or cleaning machine, a drum or roller having a narrow slot made diagonally from end to end of its periphery, fixed and movable gripping jaws located within and contiguous to the slot, a flexible surfacing material surrounding the drum having its edges inturned and extending between the jaws, a shaft upon which the drum is mounted, a rod extending through the drum and both jaws, one of said jaws having a lever-arm extension beyond its fulcrum, and means on the drum-shaft engaging said arm extension and adapted to rock the movable jaw about its fulcrum and relative to the fixed jaw.

3. In a surfacing or cleaning machine, a hollow drum or roller having a narrow slot made diagonally from end to end of its periphery, grippingjaws located within and contiguous to the slot, a shaft upon which the drum is mounted, a rod carried by the drum parallel with the shaft said rod passing through said jaws and one of said aws being continued beyond the other and its fulcrumrod to form a lever-arm, and an eccentric or cam mechanism on the drum-shaft and engaging said lever-arm extension, and turnable to close said jaws, and a flexible surfacing material surrounding the drum having its edges inturned through the slot and locked between the gripping-jaws.

4. In a surfacing or cleaning machine, a drum or roller, a flexible surfacing material surrounding said roller, a diagonally disposed slot through which the edges of the surfacing material are inturned and gripping-jaws located within the drum and contiguous to the slot whereby said edges are secured and held, said jaws being pivoted together in pairs and one of said aws having an extension beyond its pivotal center, and means engaging said extension and adapted to rock said jaw relative to the companion 5. In a surfacing or cleaning machine, a drum or roller having a narrow slot made diagonally from end to end, a surfacing material surrounding the drum having edges inturned through the slot, a jaw having its gripping edge coincident with one side of the slot, a movable jaw and a rod upon which both jaws are mounted, said movable jaw having a lever extension beyond the rod and the inner end of the companion jaw, and means upon the axis of the drum engaging said extension and by which said aw is closable against the stationary aw to grip the inturned edges of the covering material.

6. In a surfacing-machine, a longitudinally-slotted drum, a flexible surfacing material surrounding the drum, with its edges entering the slot, fulcrumed jaws, means by which the jaws are closed to grip both edges of the material and means by which said jaws are simultaneously moved radial to the axis of the drum to draw the engaged edges of the material into the drum.

7. In a surfacing-machine, a longitudinally-slotted drum, a flexible material surrounding the drum with its edges entering the slot, gripping aws, a rod extending through slots in the drum-head, upon which rod the jaws are carried in pairs, one aw of each pair being extended beyond saidrod to form a lever-arm, and a turnable eccentricinclosed by the ends of said arms, and movable to exert a tension upon the covering material.

8. In a surfacing-machine, a longitudinally-slotted drum and a flexible covering material, the contiguous edges of which enter the slot, jaws between which said edges are held, an eccentric mounted upon the drum-shaft, said aws pivoted together in pairs and one jaw of each pair being extended beyond its pivotal center to form a leverarm which clasps the eccentric, and a radially-movable rod upon which the jaws are fulcrumed.

In testimony whereof we have hereunto set our hands in presence of two subscribing witnesses.

AARON T. SPENCE. JOHN H. PRUGH. SAMUEL B. ZIMMER. Witnesses to Spence and Zimmer:

GEO. IV. REED, CLARENCE M. REED. Witnesses to Prugh: F. F. OHMERT, C. D. BASORS. 

